Sled,
The rumour from the owner was:
1. Modification to the carburettor, (apparently to stop excess fuel consumption?);
2. Modification with some sort of fuel cock mechanism under the cockpit floor (your guess is as good as mine); and
3. Modification to the fuel baffles in the tanks (to increase the useable fuel capacity?)
Lots of people will have an opinion I imagine because lots of people were shown all sorts of bits of wood etc (well, that is the rumour, right?)
But then again, as Aroa says, it is all bulls*&t and no doubt, CASA's fault.